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Interface Message Processor 
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NIT Museum photos of J.C.R, Licklier 
circa ear 
Ivan Massar 
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ert Fano and 
 he Kludge producin 
TX-O at NIT 1963 
Sutherland tSe the TX-2 Sketchpad p?gra 
Lincoln Laboratory ' , 
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About BB N 
t3ok be 'ar, ek and .",'ewman inc. is 
company of neath' 750 
app})' tccilno]oEv. 
Our busine,s ;< ', .... 
lccds foF: 
aimlied :'c,earch 
!3BN meet, [te,c nced by: 
131N crvc, u dicr,tv fi' clicnt 
[o,hm. Wa,hhhm. D.C.. 
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I97cj, ,,vhcn a o'ei-u anti-cance: diu 
,ed a; the niersitv o California with 
ROPHET. the drug's discoverer, Dr. 
pple. stated: "An aerage day of 
ludy s oten mo useful than a year 
al and error in th ab." 
>mcnt or the PROPHET system has led 
.nt development ot other research infor- 
mling sy5tm that re commercially 
_tHFO. for exami)le. is a system that 
fi 'research investigators store. retrieve. 
patient data in ritten or graphic form. 
tware product. RSII. is a general pur- 
:h toot that seines. in effect. as an 
ope;a[s tile IX,'clz'ork ' Control Ccntcr for [h Ah?PANET. 
automa features an 
English-like command language that enables users 
with little or no computer experience to store and 
file data, carry. out statistical analyses. and view data 
in graphic, tabular, or textual form. 
Medical and research applications of computers 
were not the only offspring of BBN's early work in 
time-sharing. The company developed systems for 
use in business and cocnmerce and for six years 
operated Telcomp, one of the earliest commercial 
time-sharing services. 
These activities formed the basis in 1969 for the 
award of a contract that was to take BBN into yet 
another major field of technology--packet-switched 
data communications--a field in wtnich it has con- 
tinued to make pioneering efforts of a significant 
nature. Within one year of the award of this con- 
tract from the Advanced Research Projects Agency 
of the Department of Defense. BBN designed, 
developed, and built a hardware/software system 
that allowed four geographically separated com- 
puters of different makes to communicate with 
each other. The technique used a dynamic routing 
process in which individual "packets" of data were 
transmitted over the fastest available routes in tine 
four-node network, which was interconnected with 
wide-band telephone lines leased from the Bell 
System. The dynamic routing process was called 
packet-switching, and the four-node networt, rap- 
idly grew into the ARPANET--a network that now 
includes some 20 computer centers and accom- 
modates thousands of users daily in the CJnited 
States, Hawaii and Europe. Ttne network was later 
expanded to include broadcast satellite channels. 
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[I, division scientist, has a 
;Institute, and :\I.S. aId Sc.D. 
21 engineerin from .briT. Dr. 
BBN encompass a wide range 
and advanced 
rediction, testing, mx evalua- 
mr self-noise and rada ted noise. 
activities in noise 
ling treatment designs, outer 
clesign, and test pfanzirg and 
aterests is the response of sensor 
oundar), layer {TBL} excitation. 
-damental lllClSLIFCIllClltS ()l' the 
11 pressures to the design o/sonar 
'ariet)' of naval applications. 
vision scientist, is primarily 
sign and cievelopment of inSlo- 
raors and sound sources, which 
OrlllaD Ce i II1 pI'OVcIllC [1 [s over 
esigns. Mr. Murray works on 
,terns that activcly'supress the 
ry. He is also concerneel with the 
anti i-strument systems. He has 
ics vibration of machinery 
fans, -ld wind tunnels. 
dis Royce, Ltd. and holds an 
rby, Engianct. 
tivision scientist, received a B.A. 
Kalamazoo College. an S.M. in 
m the University or' Pittsburgh, 
er science from \'I [Z Dr. Sidner's 
ecia/ties are in discourse pro- 
cation, collaborativc planning 
qd problem solving. and inter- 
;rlaphora, and speaker's mean- 
d models o(discourse that 
tion ot-rc(ercnce. and planning 
a communicative situation. 
-machine iratefaction that 
rtorms, as presenteel through a 
qoects the system to perform 
orepurer environment. [See 
BBN STC staff come to the company with a variety of educational and 
professional backgrounds. Some staff members have been with the com- 
pany since its inception fort years ago, while others have justjoined; all 
have in common a keen interest in their fields, a commitment to tlaeir work, 
and an intellectual curiosky that is continually reinforced by the company's 
strong academic ties. Each year the SDPAmzuul Report profiles a group of 
13BN STC scientists to illustrathe dirty aness of our staff. 
,.. - '. j:" ''"William Crowther--incipal Engineer 
,/.. once wrote in his curriculmn vitae, 'making 
.... {'' I computers do unexpected things. I find 
, ' -. this immensely satisfying." A principal 
'7 4' engineer in the Laboratories Division, 
, 7 ? . Will has been amajor contributor to 
 k7 the design anti implementation of the 
 ;}i ARPANET (the Advanced Researci 
i 2 Projects Agency Network) and BBN s 
'  Butterfly and Monarch pmallel proces- 
a :': sots. He x, as mstrmnental m deslgmng the 
2 j " Pluribus : multi-processor, the forerunner 
5 ' of the Butterfly and the Monarch machines, 
and contributed to the early design of the SIMNET training system. 
A mathematician by training, Will uses math to figure out what softv,'are 
programs will do and how well they ,,viii do it. He says he has always [lad 
a predilection for pragmatic math -- the kind that "makes things happen," 
not the theoretical kind used in proofs and theorems. Will first used 
computers as an undergraduate in MITs playsics department. The physics 
department had computers; the math department did not, he explains. 
From MIT, Will went to MIT's Lincoln Laboratory, v,,here he met Frank 
Heart, now director of the Laboratories Division in BBN STC, and Dave 
\Valefen, no,.,,' president of BBN STC. His favorite project tilere ,.,.'as the 
Lincoln Experimental Terminal {LET}, a mobile satellite communications 
system housed in two trailers. Tile trailers could use virtually any remote 
object, including the moon, as a surface off which to bornice communi- 
cations signals. Will designed and implemented tiao software for small 
computers that aimed the trailers' six-foot dish antennas, made error 
corrections on the returning signals, and compressed voice signals for 
digital transmission. 
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